Grinder.



W. A. & F. W. MABSCHKE. GRINDER.

APPLICATION FILED SEPT- 20. H5.

1,177,199. Patented Mar. 28, 1916.

2 SHEETS-SHEET I.

w. A. & F. w. MARSCHKE.

GRINDER.

APPLICATION F[LED SEPT. 20. 1915.

Patented Mar. 28,1916.

2 SHEETSSHEET 2.

Indiana olis,

' grinding wheel; and we UNITED 'STATES PATENT OFFICE.

INDIN, A CORPORATION Ol INDLNA.

amninnn.

8peclflcation of Letters Patent.

Patented Mar. 28, 1916.

v Application filed Septenhber so, 1915. Serialllo. 51,720.

To all whom zt ma'y comem:

Beit known that We, WILLIAM A. MARSCHKE and FREDRICH W. MARSCHKE,citizens of the United States, residing at in the county of Marion andState Indiana, have invented' a new and useful Grinder, of which thefollowing is a .specification.

It is the object of our invention to minimize the sparks which .cling toand are thrown out from the surface of an abrasive grinding wheel.

In carrying out our invention, we provide au inclosing casing for theabrasive grinding wheel, and maintain a continuous suction from thiscasing so that sparks which are produced by the rinding are largely orwholl drawn out y such suction instead of ing thrown Out through theopening at which the gr'inding wheel is exp0sefi for the application ofthe articles bem ground; and we mount this casing slida ly, ;so that asthe gfinding wheel is worn awy the casing can be slid to maintain theopening into the casing for the application of the articles to be groundas close to the grinding wheel as desired; and wemount in such casing atthe upper end of the aforesaid opening a deflector plate which is swunginward as the casingis moved to compensate for the wearing of thegrinding wheel, so that the deflector platealways remains close to thesurface of the provide an air passage on the opposite side of suchdeflector plate from such opening,

for producing a current of air for cooling any sparks which are carriedaround by the grinding wheel;

' and we prefera'bly provide a structure in eleyation,

portion of one of the grinding wheels and which a single motor drivestwo grinding.

wheels each of which is provided with a casing separately adjustable asabove de'' scribed, with both casings provided With a. singlesuction-producing means. The accompanying drawings illustrat ourinvention.

Figure 1 is a side elevation .of a grinding device embodying ourinvention, there being two grinding 'wheels driven by a single motor;Fig. 2 is a front elevation of such grinding device; Fig. 3 is anenlarged side in partial section, of the upper its casing, showingmechanisni for adjusting of Fig. 4; and

within a casing Stem 19 of which leads to tr1fugal fan 20, driven by abelt'21 from a t-h e deflector plate as the casing is slid; Fig. 4 1S asection on the lines 44 of Figs. 2 and 5; Fig. 5 is a front elevation ofthe parts shown in Fig. 4, with the lower partin section; Figs. 6 and 7are side elevations of grmders embodying a modified form of the mechanmfor working the deflector plate; Fig. 8 is a redued section on the line88 Fig. 9 is a perspective vieW of the main part of the casing, with theupper part cul: away.

The grinding device consists 10 supporting a table 11 mounted a motorelectric motor, which has a shaft 13 project-.

ing at both ends and having mounted on each prmectmg end an abrasivegrinding wheel 14. Each grinding'wheel 14 is located 15, which restsupon the table 11 and is mounted to slide forwardly and rearwardly onsuch table, being clainped in any desired position by a clampin screw 16and guided in its m'ovements by a s ide 22.

Each casing is open at the bottom andcommunicates through an opening 17in the table 11 With a pipe 18. The two pipes 18 are the upper ends of aY-shaped pipe the the inlet of a censhaft 13, so that the fan 20maintains a suction in both casings 15. Each casing 15 is eut away atthe front to provide an opening 25, for the application of articles tobe ground to the grinding wheel 14. At the bottom of this opening is theusual tool rest 26, which.is adjustably suppbrted in the casing 15. Atthe top .of the opening 25, but under the. casing'l5, is a deflectorplate 27, Which is pivotally mounted at its upper end on a pivot pin 28in the casing 15 and at its lower end is provided with an inwardlyprojecting fiange 29 which just clears the periphery of the grindingwheel 14. The deflector plate 27 is provided with an outwardly fiaredportion 30 around the pivot pin 28 for providing an air passage betweenthe outside air and the periphery of the grinding wheel 14 abovethefiange 29.

As the grinding wheel 14 is used, and wears away, thecasing 15 is slidrearward, to'expose the desired portion of the grinding .wheel throughthe opening 25. This rearis always maintained close to the periphery ofthe grinding wheel 14. This may be ac-- complished in various ways. Inthe arrangement shown in F igs. 1 t0 5. inclusive, a ring 35 is clampedon the adjacent bearing 36 of the motor,12, a by a clamping screw 37,and this ring 35 is provided with a horizontal rack 38. A pinion 39 ismounted on a pivot pin 40 on the casing 15, sothat it meshes with therack 38. A crank pin 41 on the pinion 39 is connected. by a link 42 to adownwardly projecting arm 43 from the deflector plate "27; Thus as thecasing 15 is slid rearward, the pinion 39 rolls' on the rack 38, and therotary movement of the crank pin 41 causes the deflector plate 27 to beswung downwardly so that the inner edge of the .flange 29 is maintainedin close proximity to the periphery of the grinding wheel 14.

In the modification shown in Fig. 6, the

defiector plate 27 is connected by a link 45 to the upper end of a lever46, the lower end of which is pivoted on a fixed support 47, and anintermediate point of which extnds loosely through a -transverse openingin a pivot pin 48 mounted onthe casing-l5. As the casing is inovedrearward, the upper end of the lever 46 is moved more rapidly than thecasing and the link 45 thus tilts the deflector plate 27 to draw theflange 29 close to the periphery of the grinding wheel 14.

In the modification shown in Fig. 7, an arm 50 is pivoted within andnear the bottoin ofthe casing 15, near the front thereof, and rests uponthe forward edge of the opening 17 in the table '11. This plateisconnected by a link 51 to the deflector plate 27. As the casing 15 isslid rearward, the arm 50 slides downward into the opening 17, and byits weight, transmitted through the link 51, tilts the deflector plate27 to bring the edge of the flange 29 toward the periphery of thegrinding wheel 14.

In operation, the motor 12 drives the grinding wheels 14 and the an 20.,The fan 20 sucks air into the casings 15 through the openings 25, andout of such casings through the openings 17. and the pipes 18 and 19.The casings, 15 are adjusted so that the flanges 29 are close to theperipheral surfaces of the grinding wheels 14. As the articles areplaced against the grinding wheels to be ground, and sparks areproduced, the greateramount of the sparks are d1awn out of thecasings 15by the action of the fan 20. If any sparks, however, are carried aroundby either wheel 14, such sparks are. in large part removed by the flange29 of the deflector plate 27, and are cooled by the current of airpassing through the opening provided b the flared portion 30. As eithergrinding Wheel 14 is worn tway, its casing 15 is slid rearward, and thefiange 29 is brought doser to the peripheral Surface of such wheel bysuch sliding. Fig. 3 shows in full and dotted lines respectively therelative positions of the casing and the defiector plate for thefull-sized grinding wheel, shown in full lines, and for a very muchreduced grinding wheel, shown in chain lines.

If desired, the inner surface of the casing 15 may be provided With oneor more inwardly projecting flanges 60, which project toward theperipberal surface of the grinding wheel 14 and act to catch anddeflect' some of the sparks Which may be carried around past the opening17. One of such fianges 60 is shown in d'otted limes in Fig. 4.

The-casing 15 has the main portion 65, which. is on' the side toward themotor 12 and extends around the peripher of the grinding wheel 14, and aremovable side 66 which is on that side of the grinding wheel 14 awayfrom the motor 12. The deflecting plates 67 which guide the air into theopening 17 are on the main portion 65. Near their edges toward theremovable side 66 these' deflecting plates are provided with notches 68,which receive a dove-tailed projection 69 onthe inner face of theremovable side 66. This holds the lOwer part ofthe side-66 in place. Theupper part of said side 66 is provided With two Spaced fingers 70,between which a pivoted bolt 71 may be swung, so that a winged nut 72 onsuch bolt may coperate with the 'fingers to hold the upper part of saidside 66 against' the main part 65 of the casing 15. The removable side66 is provided With an outwardly projecting cup portion 73 for fittingover the projecting portion of the motor shaft beyond the abrasive wheel14. This cupshaped-portion is indicated horizontally, to permit thesliding of the ca. 2. By removing the side 66, the abrasive heel 14 isexposed, as for removal or replz. emnt.

We claim as our invention:

1. In combination, a rotatably mounted grinding wheel, a casing therfor,said casing having an opening for' admitting articles to'be ground andbeing slidabl mounted to slide in the *::lane of the grinding wheel t0compensais. .or the wear of the grinding wheel, a deflect0r plate montedin said casing. and projecting into proximity to the periphery of thegrinding wheel, and operating means for the d'eflectorplate for swingingit inward as the casing is slid to compensate for the wear on thegrinding wheel.

2. In combination, a rotatably mounted grinding wheel, a casingtheref0r, said casing having an"opening for admitting articles to beground and being slidably mounted to slide as a unit in the plane of thegrinding 'Wheel to compensate for the wear of the grinding wheel, and adeflector plate adjustv ably mounted in said casing and projecting into'proximity to the periphery of the grinding wheel, said deflector platebeing adiustable relatively to the casing toward and from the peripheryof the grinding wheel.

3. In combinatioii, a rotatably mounted compensate for the wear on thegrinding wheel, saidcasing providing an opening for the passage of acurrent ofair on the other side of said deflector plate from saidfirstnamed opening.

4. In combination, a rotatably mounted grinding wheel, a casingtherefor, said casing having an opening for admitting articles to beground and being slidably mounted t0 slde in the plane of the grindingwheel to' compensate .for the wear of the grinding wheel, and adeflector plate adjustably mounted in said casing and projecting intoproximity to the periphery of the grinding wheel, said casi ng providingan opening for the passage 01 a current of air on the other side of saiddeflector plate from said firstnamed opening.

5. In combination, a rotatably monted grinding wheel, a casing theref0r,said casing having an opening for admitting articles to be ground andbeingslidably mounted to slide in the lane of the grinding wheel t0compensate or the wear of the grinding wheel, a deflector plate mountedin said casing and projecting into proximity to the periphery of thegrinding wheel, said Casing provding an opening for the passage of acurrent of air on the other side of said deflector plate fromsaidfirst-named opening.

6. In combination, a rotatably mounted grinding wheel, a casingtheref.or, said casing having an opening for admitting articles t0be'ground and being sldably mounted to slide in the plane of thegrinding wheel t0 compensate for the wear of the grinding wheel, saidcasing.being open at the bottom, a plate on which said casing issupported for its sliding movement, said plate having an opening throughit which registers with the opening in the bottom of the casing for allpositions of the casing, and a suction device connected to the openingin the plate.

7. In combination, a rotatably mounted grinding wheel, a casingtherefor, said casing having an opening for admitting articles to beground and being slidably mounted t0 slide in the plane of the grindingwheel t0 compensate for the wear of the grinding wheel, a deflectorplate pivotally mounted in said casing at one side of said opening andhaving at its free end a fiange projecting into proximity to theperiphery Of the grinding wheel, and means operated by the sliding ofthe casing for adjusting said deflector plate so that the inner edge ofsaid fiange always lies close to said periphery.

In witness whereof, we have hereunto set Our hands at Indianapolis,Indiana, this 18th day of September, A. Dione thousand nine hundred andfifteen.

WILLIAM A. MARSCHKE. FREDRICH W. MARSCHKE. Witnesses: l

HAROLD W. MARSCHKE, ELIZABETH H. MEIER.

